Fixed lqt slot acceptor issues #10
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The dynamically created "LqtSlotAcceptor" objects were never deleted. Wrapped it into a unique_ptr to auto-delete them, when the library is unloaded.
When multiple lua_States loaded modules (via "require") from lqt5, the application at some point crashed. The Problem was, that only one global "LqtSlotAcceptor" object is used, which holds the latest lua_State, which loaded the lqt5 module. If then a Slot from a previous lua_State was triggered the global "LqtSlotAcceptor" object accessed the wrong lua_State. To solve this, i changed the global "LqtSlotAcceptor" pointer to a std::map indexed by the "lua_State*" holding an "LqtSlotAcceptor" object for each lua_State to make sure we don´t get such conflicts.